The clips (called Carbiner clips) used in the Cat Hammock pattern in the January 2006 newsletter can be found at some craft supply or home improvement stores. Look for the nylon plastic ones instead of the aluminum or stainless steel ones. If you can't find those clips, any nylon snap hook should work. We would recommend using only the nylon plastic clips as they will wash better than the metal ones.
To see examples of hooks that we are referring to, click here. This link opens a PDF file.